SELECTEDMEASURE
Applies to: 
Calculated column
Calculated table
Measure 
Visual calculation
Used by expressions for calculation items or dynamic format strings to reference the measure that is in context.
Syntax
SELECTEDMEASURE()
Parameters
None
Return value
A reference to the measure that is currently in context when the calculation item or format string is evaluated.
Remarks
Can only be referenced in the expression for a calculation item or format string.
This function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.
Example
The following calculation item expression calculates the year-to-date for whatever the measure is in context.
CALCULATE(SELECTEDMEASURE(), DATESYTD(DimDate[Date]))
The following expression can be used to dynamically adjust the format string of a measure based upon whether a value is the hundreds, thousands, or millions.
SWITCH(
TRUE(),
SELECTEDMEASURE() < 1000,"$#,##0", //Values less than 1000 have no text after them
SELECTEDMEASURE() < 1000000, "$#,##0,.0 K", //Values between 1000 and 1000000 are formatted as #.## K
"$#,##0,,.0 M" //Values greater than 1000000 are formatted as #.## M
)